golang big endian conversion

Golang is an advanced programming language that is widely used in modern web applications, cloud computing, container technology and microservices. In the field of data processing, it is often necessary to convert data into big and small ends. This article will introduce you to Golang's big and small endian conversion methods.

1. What is big and small endian

In a computer, each data type has its representation in memory, the most important of which is byte order, usually Called big or small endian. "Big endian" means that the highest byte is stored first, and "little endian" means that the lowest byte is stored first. For example, if a 16-bit number is 0x1234, it occupies two bytes of memory in big-endian mode. The first byte is 0x12 and the second byte is 0x34. In little-endian mode, The first byte is 0x34 and the second byte is 0x12.

2. Big-endian conversion in Golang

In Golang, you can perform big-endian conversion operations through the Binary package in the standard library. The Binary package provides functions for converting between basic types and byte arrays, including functions for converting big-endian and little-endian byte order.

Among them, this article focuses on the following functions:

• func LittleEndian.Uint16(b []byte) uint16

Convert the little-endian sequence b Convert to an integer of type uint16.

• func LittleEndian.Uint32(b []byte) uint32

Convert the little-endian sequence b to an integer of type uint32.

• func LittleEndian.Uint64(b []byte) uint64

Convert the little-endian sequence b to an integer of uint64 type.

• func LittleEndian.PutUint16(b []byte, v uint16)

Write the uint16 type integer v into the little-endian sequence b.

• func LittleEndian.PutUint32(b []byte, v uint32)

Write the uint32 type integer v into the little-endian sequence b.

• func LittleEndian.PutUint64(b []byte, v uint64)

Write the uint64 type integer v into the little-endian sequence b.

For the conversion of big-endian sequences, the Binary package also provides corresponding functions. Just replace the function name prefix from BigEndian to LittleEndian.

3. Little endian conversion example

Below, we give an example of little endian conversion, taking uint16 as an example.

package main

import (

"encoding/binary"
"fmt"

)

func main() {

src := []byte{0x34, 0x12}
val := binary.LittleEndian.Uint16(src)
fmt.Println(val)

dest := make([]byte, 2)
binary.LittleEndian.PutUint16(dest, val)
fmt.Printf("%x", dest)

}

at In this example, we define a byte array src with a length of 2, which contains a uint16 type value. We use binary.LittleEndian.Uint16(src) to convert it into a little-endian sequence and print it out. Then we write the value to the new byte array dest through binary.LittleEndian.PutUint16(dest, val), and use the Printf function to output its hexadecimal representation. Run the program and the output result is as follows:

4660

1234

It can be seen that the uint16 type value 0x1234 is represented as 0x3412 in the little-endian sequence, and is converted back It can be restored to the original value later.

4. Summary

By using the functions of the Binary package, we can easily perform big-endian conversion operations in Golang. In practical applications, endian conversion is a very common data conversion method and is widely used in computer networks, storage systems, image processing and other fields. Therefore, mastering Golang's big and small endian conversion operations will be of great help to developers in data processing.

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